The controversy surrounding the building of the Panama Canal.

Describe the controversy surrounding the building of the Panama Canal.
How were the obstacles in the canal controversy overcome?
What was the Open Door Policy, and how did it come about?
Describe the five major themes of progressive reform.
Why did the reservationists and irreconcilables opposed the Treaty of
Versailles? How effective was their opposition?
Describe the defensive temper of the 1920s. What factors contributed to it?